Electric-lighting fixture



April 6 1926.

w. SYMMES ELECTRIC LIGHTING FIXTURE Filed Oct. 20, 1924 Patented Apr. 6, 1926.

UNITED srarss WHITMAN SYMMES, OF SAN FRANCISCO,

CALIFORNIA, ASSIGNOR TO THOMAS DAY COMPANY, OF SAN FRANCISCO, CALIFORNIA, A CORPORATIQN 01 CALIFORNIA.

ELECTRIC-LIGHTING FIXTURE.

Application filed. October 29, 1924. Serial No; 744,555.

To all 112710. 72. it may (.(DLCGP/t.

Be 1t known that I, WHITMAN Smnrusa citizen of the United States, and a resident of the city and county of San Francisco, State of California, have invented a certain new and useful Electric-Lighting Fixture, of which the following is a specification.

The invention relates to electric lighting fixtures andparticularly to ceiling fixtures having a bowl or acorn of non-transparent translucent material, which, is illuminated by an electric lamp contained within the fixture. Fixtures of this type usually comprise a holder or shell to which the mouth of the bowl is attached and an electric lamp socket disposed within the shell into which an incandescent lamp is inserted. The depth of the holders, as they are invariably made, is such that the lamp projects almost entirely from the holder, so that the lamp filament is positioned below the center or adjacent the bottom of the bowl or acorn. This results in an uneven or streaked illumination of the bowl, which mars the appearance and illuminating effect of the fixture.

An object of the present invention is to provide a fixture of this character, in which the filament of the electric lamp is so positioned with respect to the bowl, that the bowl is "evenly illuminated over its entire surface.

Another object of the invention is to provide an inexpensive fixture, comprising in part the fixture now generally used, to ac complish even illumination of the bowl.

A further object of the invention is to provide a fixture of the type described, embodying a Mogul socket. I

The invention possesses other advanta' geous features, some of which with the foregoing, will be set forth at length in the following description .where I shall outline in full that form of my invention which I have selected for ilh'istration in the draw ings accompanying and forming part of the present specification. In said drawings I have shown one form of lighting fixture embodying my invention, but it is to be understood that I do not limit myself to such form, since the invention, as set forth in the claim, may be embodied in a plurality of forms.

Referring to said drawings:

Figure 1 is an elevation of a lighting fix ture embodying my invention.

ergi'zed.

Figure 2 is a vertical. cross section through a portion of the fixture, disclosingits construction. p

In accordance with my invention, I arrange the socket above the shell or holder, so that the position of the lamp with respect to the bowl is raised, thereby positioning the lamp filament at or above the center of the bowl and preferably in the plane of the greatest diameter of the bowl;

T he present invention relates particularly to hanging fixtures embodying a Mogul socket, which is adapted to receive an electric lamp of large capacity. The fixture (TOHIPI'IQS an electric lamp socket 9., preferably a Mogul socket, to the upper end of which is attached a ring 3 or other device whereby the fixture may be suspended from the ceiling. The socket is. provided on its lower edge with a peripheral bead l. Resting on and depending from the bead 4 is a thin metal shell or holder 5 of increasing diameter downwardly. The lower edge of the holder is of sufiicient diameter to receive the mouth 6 of the bowl 7 and the holder is provided with means, such as the thumb screws 8, for engagement with the bead 9 on the mouth of the bowl for attaching the bowl to the holder. The bowl is made of nontransparent translucent material and is of greater diameter than the mouth 6.

Seated in the socket 2 is an electric lamp 12 having a filament 13 adapted to be heated to incandescence, the position of the socket being such that the filament is disposed substantially in the plane of the largest diameter of the bowl, or adjacent or above the center of the bowl 6. This causes the filament to be positioned well up in the bowl, so that the bowl is evenly ilhuninated over its entire surface when the filament 13 is en- The outer surface of the holder 5 is preferably finished to present a pleasing appearance and the outer surface of the socket 2 may be similarly furnished, either by painting or enameling to correspond to the finish of the holder 5, or the socket 2 may be enclosed in a metallic shell.

Means are provided for preventing an upward movement of the holder 5 such as might occur when the bowl is lifted. A lifting movement of the bowl may bring the bottom of the bowl into contact with the lower end of the lamp 12, causing destruction of the lamp, and to prevent this means are pro vided for preventing the holder 5 from 111 ving upward for any material distance with respect to the socket 2. Adjacent its upper edge, the holder is provided with one or more abutments 1%, in the present instance consisting oi'- short bolts, which contact with the lower edge of the socket as the holder is raised and limit the upward movement of the holder. The holder is provided adjacent its upper edge with plurality or ventilating apertures 15 and these apertures are conceaed by a ventilating ring 16 resting against the upper end of the holder and s aaced from the holder at its lower edge, to permit the passage of air through the holder for the purposes of rentilatien.

By virtue of this construction, an inex- Jensive fixture is produced, in which the filament is so spaced with respect to the bowl that the bowl is evenly illuminated over its entire surface. The filament is positioned substantially in the plane of the greatest diameter of the bowl or ator above the center of the bowl. By arranging the socket above the holder, a standard holaer may be employed and the lamp so positioned with respect to the bowl that the bowl is evenly illuminated over its entire surface. Features of the invention, disclosed but not claimed herein, are claimed in my copending application Serial No. 74 L554 tiled -si multaneously herewith.

I claim:

A lighting fixture comprising a lamp socket formed with a cylindrical portion of uniform diameter having a head at the lower end of said portion, a holder positioned below said socket and slidable thereon, having an inturned flange at its upper end adapted to pass over said cylindrical portion and be suspended on said socket by said flange engaging said head, means on said holder below said flange adapted to engage said head ant, limit the upward sliding movement of the holder on the socket, a bowl of nontransparent translucent material attached to and depending from the lower end of the holder, and an electric lamp seated in said socket.

.ln testimony whereof, I have hereunto set my hand.

WHITE IAN SYMMES. 

